As

The binding agent 3-mercaptopropyl-functionalised silica gel selectively binds As(III) and excludes As(V). DGT passive samplers equipped with this binding agent are available for measuring As(III) selectively.

For deployments in all types of waters you will need device LSNB-AP

For deployment in soils^A you will need device LSLB-AP

For deployments in sediments^B you will need LSPB-AP

The standard DGT device for oxyanions, based on Metsorb, measures both

As(III) and As(V).

For deployments in all types of waters you will need device LSNT-NP

For deployment in soils^A you will need device LSLT-NP

For deployments in sediments^B you will need LSPT-NP

Detailed instructions for the use of most DGT passive samplers are available.

^AThese soil devices are designed for deployment in homogenised hydrated soil samples.

^BThe sediment probes can be inserted directly into sediment and have a large enough area (exposure window 150 x 18 mm) to be capable of providing spatial information, e.g. vertical profiles or 2-D images. They have also been used to obtain similar information in hydrated soils (e.g. Luo et al., 2013).